Please pardon this newbie question:

I need a riser card or extender cable to fit my RME PCIe Interface Card into a 1U chassis.  All the riser cards are advertised as 1x, 4x, 16x, etc.  I can't find a similar description for the RME card.  Does the description "1-lane" mean "1x"?  Comparing photos, it appears the RME cards are PCIe 1x, but I just want to be sure before ordering the riser/extender.

Thanks,